If you don't know how to hook up an op-amp, then you need to start a little closer to ground zero. I'd find a tutorial and learn a little.
In case you didn't get what Grumpy_Mike is trying to tell you: The minimum allowable Vref is 1.0 volts. You can't use 100 mV. You'd be better off using the internal reference, Vint, since you don't gain anything by supplying your own.